The U.S. Department of Veterans Affairs is the world leader in research on post-traumatic stress disorder. No organization spends more money or expends more resources to treat it than the VA. Yet its efforts to stamp out the disorder, which afflicts upward of 30 percent of veterans today and is the fourth most common mental health condition in the world, are often strikingly wasteful and driven by shoddy science. In 2006, the VA began treating veterans with a form of therapy charmingly...